78.It was not _____ she took off her glasses _____ I realized she was a famous film star.
| A．when , that | B．until , that | C．until , that | D．when , then |
The problem is so complex that I'm afraid it will take me several hours to________．
| A．figure out | B．set out |
| C．break out | D．put out |
The newlylearnt words will be impressed on us only if they are ________used in everyday communication．
| A．gradually | B．accurately |
| C．familiarly | D．frequently |
The car's________ has improved a lot since a new engine has been applied to it．
| A．character | B．performance |
| C．appearance | D．attraction |
How________ you expect to get something in return when you never willingly lend a hand to others?
| A．shall | B．can | C．should | D．dare |
--- Alice is moving to her new apartment next Saturday． --- I would be glad to help her，________ need some help．
| A．if she might | B．if she will |
| C．if she | D．should she |